I am using this in Quirky 1.3 on an AOA 150 ZG5 along with the CPU Frequency Scaling Tool and CPUtemp. . The default temperature settings are fanon=63C and fanoff=58C. If it's working correctly, you should immediately hear the fans turn off. They will turn on with some intensive activity like a youtube video.

Update: To set your own temperature limits, you must work in thousands. For example:

I am using lupu528 with kernel 2.6.33.2 on a acer aspire 1 D255.
I downloaded your .pet (acerhdf-0.5.25-k2.6.33.2.pet) then installed and did a reboot, however when I try to run
modprobe acerhdf I get the following error.